This is the cheapest I've seen the DRU-510A.
Staples currently has it for $179.98:
http://www.staples.com/Catalog/Browse/S ... Sku=513120
Sony has a $30 rebate (Expires 03/31/2004):
http://www.staples.com/products/Rebates ... 513120.pdf
Then use one of these $30 off $150 codes: 34887, 51187, 32903
(If you don't want to buy online, try a printable coupon)
Final price of $119.98